Helicobacter pylori infection and inflammatory bowel disease in Asians: A meta-analysis

Table 1 Characteristics of the studies included in the meta-analysis

Ref.	Country	Study center	CD/UC,	Control,	Mean age, yr	Male, %	Helicobacter pylori detection
			n	n	(CD/UC)	(CD/UC)
Matsumura et al[19] 2001	Japan	Multiple	90/NR	525	31.7/NR	70.0/NR	IgG
Furusu et al[20] 2002	Japan	Single	25/25	25	NR	NR	IgG/Histology
Moriyama et al[21] 2005	Japan	Single	29/NR	7	31.6/NR	59.0/NR	UBT
Ando et al[22] 2008	Japan	Single	38/NR	12	28.9/NR	74.0/NR	UBT
Hong et al[23] 2009	South Korea	Single	37/43	41	38.2/44.2	73.0/67.4	Histology
Pang et al[24] 2009	China	Single	52/54	106	36.7/42.3	57.7/55.6	IgG
Song et al[25] 2009	South Korea	Multiple	147/169	316	33.5/44.7	67.3/63.3	UBT
Zhang et al[13] 2011	China	Single	104/104	416	31.0/40.9	66.3/57.7	UBT
Jin et al[26] 2013	China	Single	NR/153	121	NR/44.6	NR/51.6	UBT/Culture
Xiang et al[27] 2013	China	Single	229/NR	248	46.2/NR	58.1/NR	UBT/Culture

CD: Crohn’s disease; IgG: Immunoglobulin G; NR: Not reported; UBT: Urea breath test; UC: Ulcerative colitis.